Exhaust temps
Thread Starter
Safety Car
Joined: Sep 2005
Posts: 4,213
Likes: 643
From: Orange County Ca
Exhaust temps
I hit my headers with my infrared temp gun right at the heads and there is a difference in temp. I'm sure that this is a product of differences in the intake--stock carb and manifold, '69 427/390--and the exhaust bends, coolant flow, etc., and I'm wondering what a normal spread would be. Measured after extended fast idle with normal water temp.
#1 cylinder=675 deg F 2=720
3=720 4=685
5=805 6=815
7=860 8=840
Look ok to you?
#1 cylinder=675 deg F 2=720
3=720 4=685
5=805 6=815
7=860 8=840
Look ok to you?
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
The 4 front cylinders are closer the to carbs primaries than the rear 4 and the temps seem to show the fuel distribution differences. Under a WOT pull, the individual cylinder temps would probably be very different than at idle.
With a stock carb and manifold, there is not much you can do about fuel distribution. If it's running good, just drive it and don't worry about it.
Mike
With a stock carb and manifold, there is not much you can do about fuel distribution. If it's running good, just drive it and don't worry about it.
Mike
Le Mans Master
Joined: Jan 2006
Posts: 6,504
Likes: 139
From: Butler Pa
A Holley carb with 4 corner idle could take care of this, but the temps at idle don't mean a lot. As was said WOT temps will be different and that's what matters.
I have a Holley 950 HP with 4 corner idle on my 502.
I have a Holley 950 HP with 4 corner idle on my 502.
Advanced
Joined: Mar 2012
Posts: 68
Likes: 11
From: South Daytona Florida
Exhaust temps you listed are all within 20% of each other. Normal mostly. What you look for measuring header pipes is a big difference, that shows problems. If you have 700-800 degrees on 6 or 7 pipes, but 1 or 2 pipes measures 200 or 1200, you got trouble. Checking spark plugs is the best way to diagnose how your individual cylinders are running. Plenty of info on the internet on plug coloring and tuning.
Melting Slicks
Joined: Jul 2010
Posts: 3,176
Likes: 633
From: perth western australia
I hit my headers with my infrared temp gun right at the heads and there is a difference in temp. I'm sure that this is a product of differences in the intake--stock carb and manifold, '69 427/390--and the exhaust bends, coolant flow, etc., and I'm wondering what a normal spread would be. Measured after extended fast idle with normal water temp.
#1 cylinder=675 deg F 2=720
3=720 4=685
5=805 6=815
7=860 8=840
Look ok to you?
#1 cylinder=675 deg F 2=720
3=720 4=685
5=805 6=815
7=860 8=840
Look ok to you?
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